Ore-stamp



No. 6|5,369. Patented Dec. 6, I898. D. M. & J. E. SMYTH.

URE STAMP.

(No Model.)

" venom! UNITED STATES PATENT OFFICE.

DAVID M. SMYTH AND JOSEPH E. SMYTH, OF PASADENA, CALIFORNIA.

ORE-STAM P.

SPECIFICATION forming part of Letters Patent No. 615,369, dated December6, 1898. Application filed November 29, 1897. Serial No. 660,077. (Nomodel.)

instances a second helix has been made use of to accelerate the fall ofthe stamp; but in consequence of the heavy weight of the stamp and thereciprocation of the same and the strength of current required the partsare lia- I 5 ble to become heated, and there is difficulty in energizingthe core with sufficient rapidity to accelerate the stamp to advantagein its downward movement.

To overcome the foregoing objections, we

make use of an electric stamp having a solenoid and helix for raisingthe stamp and an inclosing vessel for the helix, into which water isallowed to pass, the wire of the helix being insulated with waterproofmaterial, and the 2 {water is allowed to overflow and pass down into themortar or basin of the stamp, and in this manner the water required inthe stamp is availed of for keeping the core and helix from becomingheated, and in order to obtain the necessary speed of action tosupplement gravity in moving the stamp downward a lever, preferably inthe form of a spring, is employed, and a solenoid-core for acting uponthe same as soon as the stamp has reached its extreme upward movement.

In the-drawings, Figure 1 is a vertical section illustrating the presentimprovement, and Fig. 2 is a plan view of the same.

The stamp is composed of the bar E, which becomes a core with the shoeor stamp D at the lower end, and any suitable mortar or basin L isprovided, into which the ore to be acted upon is introduced as usual,and a guide E is provided for the stamp, and around the upper end of thebarE a helix A is provided,

through which an electric current is passed for raising the bar E as asolenoid-core, and with it the stamp or shoe D, and when the current isturned ofi the stamp falls by gravi- 5'0 tation and is accelerated, ashereinafter described.

The helix A is of wire with an insulatingcovering that is renderedwaterproof by asphalt or other resinous material, and there is a vesselfor holding this helix, which vessel is advantageously made of brasswith a tubular center 2, a bottom 3, and an exterior case or inclosure4, and a vessel 13, suitably supported, receives the helix and itsinclosure, and water supplied in any suitable manner, such as from apipe 0, is allowed to flow into the vessel B, so as to keep the helix Acool, and the water overflows and runs into the mortar L, advantageouslypassing down upon the surface of the bar E, so that the water requiredin the mortar or basin of the stamp first acts to cool the helix andthen to supply the basin of the stamp.

The upper part of the bar E is advantageously made cylindrical to act asa guide and of non-magu etic material. We prefer to use wood incasedwith a brass tube, and the upper end of the wood projects beyond thetube to come into contact with the spring E, which is pivoted at 6 andprovided with an arm 7 and link 8, connecting the spring to the core Iwithin the helix II, and there is an arm 9 projecting from the spring For arm '7 and acting as a circuit-changer upon the switch G, and-onecircuit-wire 10 is connected with the arm 9 and the other circuit-wirewith the switch G and from there through the helix I-I to the source ofelectric energy, so that when the stamp E is raised the upper endthereof acts upon the spring F, lifting such spring and the core I andmoving the arm 9, so as to close the circuit through the helix H, andthe position of the parts is such that this closure occurs as the bar Eis fully elevated and the electric current turned off'from the helix A,and in this operation the energizing of the helix H draws down the coreI forcefully and through the spring F augments the blow of the stamp byfollowing the same up as it falls by gravity, the spring Fin consequenceof its leverage having a more rapid movement than the fall of the stampby gravity. The core I may be cylindrical and of the desired length toact sufficiently as a solenoid within the helix H; but we find that itoperates most advantageously when made as a hollow cone, as representedin the drawings.

The circuit-changer that controls the current passing through the helixA may be actuated in any desired manner. We have, however, illustratedcircuit connections through the switch G from the same source ofelectric energy as that acting in the helix H.

It will be apparent that the electromagnet H and the spring F may beemployed to act upon the stamp for accelerating the downward movement ofthe same regardless of the device employed for raising the stamp, and inconsequence of the spring and magnet acting with rapidity through theleverage of the pivoted spring a blow can be struck by a light stampwith as much energy as that derived from a heavy stamp when falling bygravity.

The parts of the switch may be so proportioned as to direct the currentthrough the helix H slightly in advance of the stamp, reaching itshighest point of elevation in order that the electric energy may beavailed of in arresting the upward movement of the stamp and ininstantly throwing the same down with an accelerated velocity, and thecurrent can be turned through the helix A by the switch at the momentthe stamp strikes in the mortar, so that any rebound of the stamp isaugmented by the electric action as the stamp is raised.

It will be apparent that in consequence of the helix A surrounding onlythe upper end of the iron portion of the bar the magnetism acts to thebest advantage in raising the stamp the required distance and that thenon-magnetic portion E of the bar E serves to guide the stamp in itsmovement and also to move the spring and circuit-changer, and againstthis wooden portion of the stamp -bar the spring acts in throwing downthe stamp.

If desired, the water may flow only upon the outside of the metalliccase inclosing the electromagnetic helix, so as to keep the parts coolwithout coming into contact with the insulating-covering of the Wires;but when such insulating-coverin g is of waterproof material we find itadvantageous to allow the water to run into the metallic case inclosingthe helix.

In some instances springs have been made use of in throwing down thestampsin oremills 5 but such springs have formed resistances to theupward movement of the stamps and have increased the friction and wearupon the parts, and electromagnets have been employed, as in the patentof D. M. Smyth, No. 605,615, for drawing down and accelerating the fallof the stamp in an ore-stamp.

In our present improvementthe power is not applied to the spring untilthe stamp has been raised or nearly so, and for this reason there islittle or no resistance of the spring to the upward movement of thestamp, and in consequence of the leverage of the spring as it actsbetween the electromagnet and the stamp the spring is rendered efiicientduring the descent of the stamp and with a comparatively small movementof the electromagnet.

e claim as our inventionl. The combination with the ore-stamp andcircuit closing and breaking devices, of a helix with a waterproofinsulating-covering and surrounding such stamp, for raising the stampbythe magnetic action,a case surrounding the helix, and means fordirecting a current of water upon the helix and for conveyin g suchwater from the helix to the mortar of the stamp-mill, substantially asset forth.

2. The combination in an ore-stamp with the shoe and iron bar, of anextension to the upper end of the iron bar of non-magnetic material,electric circuit closing and breaking devices, and a helix surroundingthe nonmagnetic portion of thebar and closely adjacentto the upper endof the iron portion when the stamp rests in the mortar whereby the stampis guided and the magnetism set up by the helix acts sufficiently uponthe iron bar to raise the stamp, substantially as set forth.

3. The combination in an ore-stamp with the shoe and iron bar, of anextension, to the upper end of the iron bar, of non-magnetic material,electric circuit closing and breaking devices, a helix surrounding thenonmagnetic portion of the bar and closely ad jacent to the upper end ofthe iron portion when the stamp rests in the mortar, whereby the stampis guided and the magnetism set up by the helix acts sufficiently uponthe iron bar to raise the stamp, a casing surrounding the helix and apipe supplying water to the casing previous to the same running into themortar of the stamp forpreventing the core or helix becoming heated,substantially as set forth.

4. The combination with the ore-stamp of an electromagnet having areciprocating core, a spring-lever to which the core is connected and apivot for the spring, the longer arm of such spring acting upon theore-stamp and circuit connections to the electromagnet for energizingthe same and by the leverage of the spring accelerating the downwardmove ment of the stamp, substantially as set forth.

5. The combination with the stamp and means for raising the same, of anelectromagnet and a spring connected with the core of the magnet andhaving the longer arm acting by leverage upon the stamp for acceleratingthe downward movement of the stamp by the energy of the electromagnet,substantially as set forth.

6. The combination with the ore-stamp having a vertical bar, of twoseparate electromagnets, one acting on the bar to raise the stamp andthe other electromagnet acting to accelerate the downward movement ofthe stamp, casings for the helices of the electromagnets, and means forsupplying water to such casings for preventing the electromagnetsheating, and means for causing the water to pass from the magnet-casingto the mortar of the stamp-mill, substantially as set forth.

7. The combination with the bar and shoe IIO a spring connected to thecore or armature of the electromagnet and acting upon the upper end ofthe bar of the stamp, and a switch for 15 directing the electriccurrents through the respective helices, substantially as set forth.

Signed by us this 27th day of October, 1897.

DAVID M. SMYTH. JOSEPH E. SMYTH.

Witnesses:

J OHN McDoNALD, ANN E. DEAN.

